Firefox Support Forum

I was cleaning out my hard drive and deleting old installs of Microsoft Visual Studio Redistributable packages, and I almost certainly deleted the one that Firefox relies on.

I then attempted to start Firefox, getting the error, "The code execution cannot proceed because VCRUNTIME140_1.dll was not found. Reinstalling the program may fix this problem."

I uninstalled, following the clean install directions, and deleting the "Program Files/Mozilla Firefox/" directory.

Then, I ran the Firefox Installer, newly downloaded, and when running it, it gives the same error, "The code execution cannot proceed because VCRUNTIME140_1.dll was not found. Reinstalling the program may fix this problem." Selecting "Restore Defaults" has no effect either way. The installer then appears to complete in the background, and the Firefox directory is created, along with the executable.

When I run Firefox.exe, it seems to load the program, but any address I type in fails to begin loading. This includes websites (www.google.com) and help/utility pages (about:config). I'm therefore unable to change any settings within Firefox.

I then tried re-installing the "Visual C++ 2008" and "Visual C++ 2015-2019" packages in an attempt to restore that DLL, but that had no effect after repeating the same steps above (clean uninstall, re-install). Which VC++ Redist Package should I be re-installing? Ideally, I should be able to just get a copy of VCRUNTIME140_1.dll and place it where Firefox is looking for it.

Hi Is Firefox portable from this site secure or can I trust this site? portableapps.com I would like to use it on my usb for online shopping :) regards

I use firefox 83.0 on Ubuntu 20.04. Browser does not play videos on Twitter, Reddit or Netflix. Youtube plays some videos but some videos show error "your browser does not currently recognize any of the video formats available". I cannot find any viable solution. what should I do?

I installed chrome and it plays all the videos. So there must not be any problem in OS.

Hi Support!

Where is the bookmark file for Mozilla Firefox for Windows 10? I'd like to make a backup of it.

Thanks so much for your help!

ToSt

I understand the newest version of Firefox offers support for WebP images, which is cool and great... but not when I need to download those images for use on my computer. As an artist I need to be able to save things as .jpg or .png for my art programs (or even preview) to be able to open them. Is there any way to make this an option, or to not default to webp when saving images?

I've also tried changing the extension on the file using the "all files" option but it just corrupts the file and won't open them.

I have open half a dozen or so tabs related to one subject. I would like to put them all into one "super tab", such that only the super tab shows as an open tab. Then, by clicking on that tab, it would show the tabs within it, any one or more of which could be selected. Is this possible, and if so how is it done? Perhaps there's an add-on or extension that would do this.

I have already created a multi-tab bookmark that sorta, maybe accomplishes the same thing. But it's not as convenient as what I envision as described above.

Thanks for any advice or words of wisdom.

I am trying to get Firefox browser to remember my credit cards. I found the following instruction dated 6/12/18:

"Mozilla is slowly enabling formautofill for credit cars spread out over a number of new version released, and initially for a certain percent of en-US users. The code is inside Firefox but just not enabled for all users. For users who didn't get it enabled automatically that can be done manually like this.

In about:config use the Search at the top for this pref - extensions.formautofill.creditCards.available - then right-click and Toggle that pref to True."

I have not utilized about:config in the browser before. I've used something similar in Thunderbird, but I seem to never remember exactly how to get to that file. I'll write it down this time in hopes I can access it. Firefox v77.0, Windows 10. p.s. When I try to search in Help for "how to find about:config" or any other form of the question, Help simply gives me all results that include "about:config".

Thank you for your time, --Vic

I have a Linux system with Firefox 83.0 installed. I also have a CSV file of logins from an earlier Firefox. How can I import or use this CSV file to move over my logins/passwords. I wish not to use Sync because it is someone else's machine. Robert

Hello,

I just upgraded to Firefox 87 and noticed that I wasn't able to go back to the previous webpage by clicking on the backspace button like what I have done in the past if I'm not using a mouse on my laptop and had to click on the back button in the toolbar with the trackpad. I'm not too sure of why that happened with the upgrade and was a little surprised about that. Hope I can be able to get around this in some way if one of you know anything about this. Thanks.

On my internal sites I'm getting this error SEC_ERROR_INADEQUATE_KEY_USAGE

My other colleagues using FF v82 do not get the error. I have cleared cache and cookies , but still not working. The browser is not even giving me an option to proceed. How can I get past this ?

Hi all,

I am trying to customize my Firefox on Mac because the tabs on top interfere with the menu bar, thus I only want tree-style tab extension to work on the side, with the tabs on top disabled.

I followed this thread: https://support.mozilla.org/en-US/questions/1184674#answer-1028260 as well as this clear guide on how to create userChrome.css: https://www.userchrome.org/how-create-userchrome-css.html When I tried to restart the browser, I seemed to have been logged out of my profile, with all customization gone and a standard white (instead of black) menu. I deleted the chrome folder and it is normal again now.

I suspect the userChrome.css file should contain more than just the one line I tried to add: #tabbrowser-tabs { visibility: collapse !important; } ; Is there any location where I can copy my current intra-browser customization into the userChrome.css file?

Hello all,

I run a bunch of web applets locally on my computer for personal use only (http://localhost/...), and until recently I could successfully launch FF using window.open(...) with the new window NOT showing the address bar (because it takes space and looks ugly within the applet, so I want to avoid it at all cost).

I believe this changed with FF 76 (I now run v. 76.0.1 64-bit on a Windows10 based computer), anyway at this point it seems impossible to NOT have the address bar show up in a FF window. :-/

To be clear : I have searched for a solution in this forum and elsewhere, found the solution to another new problem with FF ("megabar"), also seen the trick to hide the url in the address bar - but this is not what I'm looking for : I just want to *get rid of the address bar*, period.

Thanxx in advance for any help with this issue (surprised noone else seems to complain about this). :)

It's good to have those built-in shortcuts, but it's stupid you can't modify them. When I use this website I can't input the division sign by pressing / on the keypad because it's the shortcut for Quick Find. I guess this is because the place to input is not a normal text box like in WolframAlpha , but part of the whole webpage(?). Add the function to customise shortcuts is much easier than let Firefox recognise and deal with this situation, I think. In fact, most software supports customising shortcuts, so I'm surprised to find there's no way for Firefox to do that.

I had Java working with a JRE using Java SE7 or SE8. I just let Java install an update; now no valid JRE is installed to let my Java applications using Java to run. How do get a version of Java that will work with the Firefox browser on Windows 10.

Windows 10 gesture two finger swipe left and two finger swipe right doesn't work in Firefox. Two finger swipe left allows user to go history backward and two finger swipe right allows user to go history forward. These gestures work in Firefox if the user hold Alt key and preform the gestures. But most of the users don't like to hold Alt key and preform the gestures. Please fix that issue.

Viewing two tabs side-by-side can be very helpful, for example when copying information across. This used to work in older version using the AddOns tiled=tabs/pages. But in FF76 tiled-pages has very limited functionality and does not work for me for any page that requires javascript - so most pages requiring logins are out.

How can I get this very time-saving functionality back?